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Effect of Nonpolar Gases on the Storage of Persimmon Fruits (diospyros Khaki L.) at Different Temperatures

M. A. Rahman
Bangladesh Rice Research lnstitwe, Gazipur, Banglaciesh

AKM Saiful lslam
Bangladesh Rice Research lnstitwe, Gazipur, Banglaciesh

A. Khair
Jahangirnagar University,Dhaka, Bangladesh,

B. K. Bala
Bangladesh Agricultural University, Mymensingh, Bangladesh

Abstract/ Executive Summary:

Two tests were conducted using xenon (Xe), krypton (Kr) and nitrogen (N₂) for storage of persimmon fruit. Under test-1, fruits were treated with Xe, Kr and N₂, at a partial pressure of 0.3Mpa for nine days at 10,C. ln test-2, only Xe gas was applied with 0.3MPa to the fruits for 17 days at 15⁰C. ln test-1, the estimated respiration rate was the lowest at 3.1 mgco₂, kg^-1 h^-1 in Xe treated sample, while it was s.9, 6.7 and 6.9 mgco₂, kg^-1,h^-1 for Kr, N₂, and control treatments respectively. No significant changes in colour and tasre were observed at all. ln test-2, Xe treatment showed a lower respiration rate (B.O mgCO₂, kg-¹h-¹ as compared with the control (10.2 mgCO₂, kg^-1 h^-1). The respiration rates were 47 and 22% lower in Xe treated persimmons than that of the control at 10⁰C and 15⁰C, respectively. ln the control treatment, colour was started to deteriorate after nine days (test -21). Suppression of both the colour change and browning of flesh were observed in the treated sample. Metabolic activity was suppressed in samples treated with Xe. lt was concluded that the Xe treated sample was in good condition. Therefore, the Xe treatment could be used for extending the storage life of persimmon fruit.

Keywords: Nonpolar gas, Presimmon fruit, Storage, Respiration, Colour, Browing

Location: The farmers fields at Saitama, Japan

Start Date: 01-11-1995

End Date: 31-12-1995

Program Area: Postharvest and Agro-processing

Non-commodity: Adoption of technology

Objectives:

To identify the Effect of Nonpolar Gases on the Storage of Persimmon Fruits (Diospyros Khaki L.) at Different Temperatures

Methodology:

Fruits of almost the same maturity and colour were harvested from the farmers fields at Saitama, Japan between November and December, 1995. Within 2 hrs of harvest the fruits were transported to the Laboratory of Bioprocess Engineering at the University of Tokyo, Japan. The fruits were cleaned and then selected for storage for tesl- I and test- 2. Fruits were placed in acrylic resin containers of volume 0.95 L, having inside diameter of 110 x 10³x1O^-3 m and height ol 100 x 10^-3 m. For test- 1, four containers were used, including a control. immediately after closing the lids of the containers Xe, Kr and Nr, respectively were superimposed to the atmospheric air at pressure of 0.30MPa and constant room temperature of 20^oC. Then four containers were placed in a chamber at a constant temperature of 10^oC. Gas chromatograph (GC-144, Shimadzu Co., Japan) was used to measure the CO², concentration. About 1 ml gas sample was drawn from the storage containers with the help of gas syringe and was adjusted to 0.5-ml before injecting into a GC, fitted with a thermal conductivity detector at 90^oC. The flow rate for the carrier gas of helium was 30ml min^-1. The partial pressure of CO₂ (PCO₂) and COEC were calculated as mentioned. lnner pressure (kg/cm²) of the sample container was measured by the- pressr.rre monitor (pM 222, GL Science). The surface colour and weight loss were determined at the initial and final stage of experiment. The changes in surface colour at three different parts were determined and the average value was taken as a colour parameter of L* a*, and b* values for test- 2. The surface colour of fresh products was determined using a colour and colour difference meter (model Z-1001DP, Nippon Denshoku Kogyo Co., Japan). The total colour difference DE was calculated, from the initial and final differences of L*, a* and b* values. Where, L* = lightness/darkness, a* = green/light, b* = blue/yellow, L*2 = a*2 and b*2 indicates reading at the end while l*, a* and b* 1 pertain to initial readings. The total colour difference-value was classified by National Bureau ofl Standard (NBS) unit. The signs of flesh browning were visually observed at the end of experiment.

Source of Information: Pakistan Journal of Biological Sciences 5 (1): 84-87, 2002; Asian Network for Scientific information 2002.

Article Link (Online Journal):

Funding Source:

Total Budget (Tk.) :

Achievement/Findings:

The quality of fruit as judged by tasting was found to be fresh in Xe treated sample at 15⁰C and 0.4 MPa Xe pressure up to 17 days of storage. Therefore, Xe treatment might be a useful storage method for fresh agricultural products. ln the control treatment, colour was started to deteriorate after nine days (test -21). Suppression of both the colour change and browning of flesh were observed in the treated sample. Metabolic activity was suppressed in samples treated with Xe. lt was concluded that the Xe treated sample was in good condition. Therefore, the Xe treatment could be used for extending the storage life of persimmon fruit.

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